Sir, when josaa registration starts.

Hello,
The registration process for JoSAA 2019 will start from June 16 at 10:00 AM. Students who have qualified JEE Advanced 2019 and aspiring of admissions in IITs have to register for JoSAA 2019. The admission process for admissions in 23IITs, 31NITs, 25IIITsand 28 Other-Government Funded Technical Institutes (Other-GFTIs) is managed by JoSAA.
For furthermore information please go through the link provided below :

https://engineering.careers360.com/articles/josaa

I hope this would help you. For further queries please feel free to write me down in the comment box.